EP1516445A4 - Procede de fourniture de services multimedia dans un systeme de radiocommunication mobile - Google Patents

Procede de fourniture de services multimedia dans un systeme de radiocommunication mobile

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Publication number
EP1516445A4
EP1516445A4 EP03760965A EP03760965A EP1516445A4 EP 1516445 A4 EP1516445 A4 EP 1516445A4 EP 03760965 A EP03760965 A EP 03760965A EP 03760965 A EP03760965 A EP 03760965A EP 1516445 A4 EP1516445 A4 EP 1516445A4
Authority
EP
European Patent Office
Prior art keywords
mbms
identifier
data unit
protocol data
terminal
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP03760965A
Other languages
German (de)
English (en)
Other versions
EP1516445B1 (fr
EP1516445A1 (fr
Inventor
Seung-June Yi
Young-Dae Lee
So-Young Lee
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
LG Electronics Inc
Original Assignee
LG Electronics Inc
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Filing date
Publication date
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Publication of EP1516445A1 publication Critical patent/EP1516445A1/fr
Publication of EP1516445A4 publication Critical patent/EP1516445A4/fr
Application granted granted Critical
Publication of EP1516445B1 publication Critical patent/EP1516445B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
    • H04W4/06—Selective distribution of broadcast services, e.g. multimedia broadcast multicast service [MBMS]; Services to user groups; One-way selective calling services
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00—Data switching networks
    • H04L12/02—Details
    • H04L12/16—Arrangements for providing special services to substations
    • H04L12/18—Arrangements for providing special services to substations for broadcast or conference, e.g. multicast
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00—Data switching networks
    • H04L12/02—Details
    • H04L12/16—Arrangements for providing special services to substations
    • H04L12/18—Arrangements for providing special services to substations for broadcast or conference, e.g. multicast
    • H04L12/189—Arrangements for providing special services to substations for broadcast or conference, e.g. multicast in combination with wireless systems
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/40—Connection management for selective distribution or broadcast
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W8/00—Network data management
    • H04W8/26—Network addressing or numbering for mobility support
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00—Data switching networks
    • H04L12/02—Details
    • H04L12/16—Arrangements for providing special services to substations
    • H04L12/18—Arrangements for providing special services to substations for broadcast or conference, e.g. multicast
    • H04L12/185—Arrangements for providing special services to substations for broadcast or conference, e.g. multicast with management of multicast group membership
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
    • H04W4/12—Messaging; Mailboxes; Announcements

Definitions

  • the present invention relates to a multimedia broadcast/multicast service (MBMS) of a universal mobile telecommunications system (UMTS) and, more particularly, to a multimedia service providing method for providing an MBMS service by using a radio network temporary identifier (RNTI).
  • MBMS multimedia broadcast/multicast service
  • UMTS universal mobile telecommunications system
  • RNTI radio network temporary identifier
  • UMTS universal mobile telecommunications system
  • GSM Global System for Mobile communications
  • W-CDMA wideband code division multiple access
  • Figure 1 illustrates an example of the construction of a general UMTS network. As shown in Figure 1 , the UMTS is roughly divided into a terminal, a
  • the UTRAN includes one or more radio network sub-systems (RNS), each of RNSs includes one RNC and one or more Node Bs managed by the RNC. Each of Node Bs are managed by the RNC, receive information sent by the physical layer of the terminal through an uplink, and transmit data to the terminal through a downlink. Node Bs, thus, operate as access points of the UTRAN for terminal.
  • RNS radio network sub-systems
  • Each of Node Bs are managed by the RNC, receive information sent by the physical layer of the terminal through an uplink, and transmit data to the terminal through a downlink. Node Bs, thus, operate as access points of the UTRAN for terminal.
  • a primary function of the UTRAN is to constitute and maintain a radio access bearer (RAB) for a communication between the terminal and the core network.
  • RAB radio access bearer
  • the core network applies requirements for a quality of service of an end-to-end to the RAB, and the RAB supports the QoS requirement the core network 130 sets.
  • the UTRAN can satisfy the QoS requirement of the end-to-end.
  • the RAB service can be divided into lower conceptional lu Bearer service and Radio Bearer service.
  • the lu Bearer service handles a reliable transmission of a user data in the boundary node between the UTRAN and the core network, while the radio bearer service handles a reliable transmission of a user data between the terminal and the UTRAN.
  • Figure 2 shows a structure of a radio protocol between a terminal which operates based on a 3GPP RAN specification and a UTRAN.
  • the radio protocol is horizontally formed of a physical layer (PHY), a data link layer, and a network layer and is vertically divided into a control plane for transmitting a control information and a user plane for transmitting data information.
  • the user plane is a region to which traffic information of a user such as voice or an IP packet is transmitted.
  • the control plane is a region to which control information such as an interface of a network or maintenance and management of a call is transmitted.
  • protocol layers can be divided into a first layer (L1 ), a second layer (L2), and a third layer (L3) based on three lower layers of an open system interconnection (OSI) standard model well known in a communication system.
  • OSI open system interconnection
  • the first layer (L1 ) provides information transfer service to an upper layer by using various radio transmission techniques. It is connected to an MAC (Medium Access Control) layer at the upper position through a transport channel, and data between the MAC layer and a physical layer are moved through the transport channel.
  • MAC Medium Access Control
  • the MAC provides assignment service of an MAC parameter for assigning and re-assigning a radio resource. It is connected to a radio link control layer, an upper layer, by a logical channel, and various logical channels are provided according to the kind of transmitted information. In general, when information of the control plane is transmitted, a control channel is used. When information of the user plane is transmitted, a traffic channel is used.
  • the MAC is classified into MAC-b sublayer, MAC-d sublayer and MAC-c/sh sublayer according to the type of transport channel it manages.
  • the MAC-b sublayer manages a broadcast channel (BCH), a transport channel handling broadcast of system information.
  • BCH broadcast channel
  • the MAC-c/sh sublayer manages a common or shared transport channel such as the FACH or a DSCH (Downlink Shared Channel) shared by multiple terminals.
  • the MAC-c/sh sublayer is positioned in the CRNC. Since the MAC-c/sh sublayer manages channels shared by every terminal in a cell, one MAC-c/sh sublayer exists in each cell.
  • the MAC-d sublayer manages a dedicated channel (DCH), a dedicated transport channel for a specific terminal. Therefore, the MAC-d sublayer is positioned at the SRNC handling management of a corresponding terminal and one MAC-d sublayer exists in each terminal.
  • the RLC layer supports reliable data transmission and performs a function of segmentation and concatenation of RLC service data unit (SDU) coming down from an upper layer.
  • SDU RLC service data unit
  • the RLC SDU delivered from the upper layer is adjusted in its size suitable for a processing capacity in the RLC layer, to which header information is added and transmitted as a protocol data unit form to the MAC layer.
  • the RLC layer has an RLC buffer to store RLC SDU or PDUs coming down from the upper layer.
  • a broadcast/multicast control (BMC) layer schedules a cell broadcast
  • CB channel assignment message delivered from the core network and allows user equipments positioned in a specific cell to perform a broadcast function.
  • the CB message delivered from the upper layer is added with information such as a message ID, a serial number or a coding scheme and transmitted as the BMC message form to the RLC layer, and transmitted to the MAC layer through the logical channel CTCH (Common Traffic Channel).
  • CTCH Common Traffic Channel
  • the logical channel CTCH is mapped with the transport channel FACH and S-CCPCH.
  • a packet data convergence protocol (PDCP) layer is positioned at an upper side of the RLC layer and allows data to be transmitted through a network protocol such as an IPv4 or IPv6 to be effectively transmitted on the radio Interface with a relatively small bandwidth.
  • the PDCP layer performs a function of reducing unnecessary control information, which is called a header compression, and RFC2507 and RFC3095, a header compression technique defined in an Internet standardization group called IETF (Internet Engineering Task Force).
  • IETF Internet Engineering Task Force
  • the radio resource control (RRC) layer positioned in the lowest portion of the L3 is defined only in the control plane and controls the logical channels, the transport channels, and the physical channels in relation to the setup, the reconfiguration, and the release of the RBs.
  • the RB is a service provided by the second layer for data transmission between the terminal and the UTRAN. Setting up the RB means processes of stipulating the characteristics of a protocol layer and a channel, which are required for providing a specific service, and setting the respective detailed parameters and operation methods.
  • the multimedia broadcast/multicast service (MBMS) will now be described.
  • the MBMS is a service transmitting multimedia data such as an audio, a video or an image to a plurality of terminals by using a uni-directional point-to-multipoint bearer service.
  • UTRAN transmits the MBMS data over a downlink common transport channel such as FACH or DSCH in order to heighten an efficiency of a radio network.
  • the MBMS has two types of modes of a broadcast mode and a multicast mode. Namely, the MBMS service is divided into an MBMS broadcast service and an MBMS multicast service.
  • the MBMS broadcast mode is a service transmitting multimedia data to every user located in a broadcast area.
  • the broadcast area herein refers to an area where a broadcast service is available.
  • One or more broadcast areas can exist in one public land mobile network (PLMN), and one or more broadcast services can be provided in one broadcast area. Further, one broadcast service can be provided to several broadcast areas.
  • the MBMS multicast mode is a service for transmitting multimedia data only to a specific user group in a multicast area.
  • the multicast area refers to an area where a multicast service is available.
  • the multicast group refers to a user group receiving a specific multicast service
  • joining herein refers to a behavior of joining to the multicast group for receiving the specific multicast service.
  • the radio network temporary identifier (RNTI) will now be described.
  • the RNTI is used as identification information of a terminal while connection is maintained between the terminal and the UTRAN, including S- RNTI, D-RNTI, C-RNTI and U-RNTI.
  • S-RNTI (Serving RNC RNTI) is assigned by an SRNC (Serving RNC) when a connection is set up between the terminal and the UTRAN, and used as base information for the SRNC to identify a terminal.
  • SRNC Serving RNC
  • D-RNTI (Drift RNTI) is assigned by a DRNC (Drift RNC) when a handover occurs between radio network controllers according to a terminal's movement.
  • DRNC Drift RNC
  • C-RNTI Cell RNTI
  • Cell RNTI Cell RNTI
  • U-RNTI consists of an SRNC identity and an S-RNTI and provides absolute identification information of a terminal in case that identification information of an SRNC managing a terminal and identification information of a terminal in the corresponding terminal can not be recognized.
  • an MAC-c/sh layer When data is transmitted by using a common transport channel, an MAC-c/sh layer includes C-RNTI or U-RNTI in a header of an MAC PDU and transmits it. At this time, the header of the MAC PDU also includes a UE ID type indicator informing a type of the RNTI.
  • One or more physical channel S-CCPCH can be provided by a cell, so that a terminal desires to receive a transmission channel FACH (Forward Access Channel) or a PCH (Paging Channel), it first selects a mapped S-CCPCH channel. That is, the terminal selects a S-CCPCH channel to be received by itself by using the U-RNTI.
  • FACH Forward Access Channel
  • PCH Policy Channel
  • the conventional RNTIs are used only for the point-to-point radio service, they serve to identify only one terminal. Thus, when the terminal receives data through the downlink common transport channel, it recognizes whether the RNTI included in the header of the MAC PDU is the same as an RNTI assigned to itself and transfers only data including the same RNTI. However, the MBMS transmitting data to a plurality of terminal, that is, to a terminal group, by using the point-to-multipoint radio service on the radio, the conventional RNTI can not be used.
  • RNTIs of plural terminals for receiving a corresponding data should be all included in the header of the MAC PDU. Then, RNTIs as many as the receiving terminals are included in the header of the MAC PDU, the header becomes fat.
  • an object of the present invention is to provide a multimedia service providing method in a radio mobile telecommunication system that provides a radio network temporary identifier (RNTI) suitable for MBMS service.
  • Another object of the present invention is to provide a multimedia service providing method of an universal mobile telecommunication system capable of transmitting only a specific data to an upper layer by an MAC.
  • RNTI radio network temporary identifier
  • Still another object of the present invention is to provide a multimedia service providing method in an universal mobile telecommunication system capable of assigning a radio resource, configuration and control information through an RNTI.
  • a multimedia service providing method in an universal mobile telecommunication system in which multimedia broadcast/multicast service (MBMS) is provided to plural terminals, including: generating an identifier for a specific MBMS service; adding the generated identifier to every MBMS protocol data unit; and transferring the MBMS protocol data unit to a terminal.
  • MBMS multimedia broadcast/multicast service
  • the identifier is an MBMS radio network temporary identifier (RNTI).
  • RNTI radio network temporary identifier
  • the identifier is generated from a radio resource control (RRC) layer.
  • RRC radio resource control
  • the RRC layer generates the identifier when a radio access bearer is established, and discards the identifier when the radio access bearer is released.
  • the identifier indicates a specific MBMS service or a multicast group.
  • the specific MBMS service is a broadcast service or a multicast service.
  • the identifier is included in header of an MBMS protocol data unit.
  • the MBMS protocol data unit is an MAC protocol data unit and the header is a header of the MAC protocol data unit.
  • the MBMS protocol data unit includes an indicator indicating a type of the identifier.
  • a multimedia service providing method in an universal mobile telecommunication system in which multimedia broadcast/multicast service (MBMS) is provided to a terminal group consisting of plural terminals, including: generating an identifier for an MBMS service and assigning it to a terminal group; adding an MBMS identifier in the MBMS protocol data unit and transmitting it to the terminal group; and comparing the MBMS identifier contained in the received MBMS protocol data unit and the assigned MBMS identifier and receiving the MBMS protocol data unit by each terminal.
  • MBMS multimedia broadcast/multicast service
  • the MBMS identifier is an MBMS radio network temporary identifier (RNTI).
  • RNTI radio network temporary identifier
  • the MBMS identifier is generated by an RRC (Radio Resource Control) layer of UTRAN.
  • RRC Radio Resource Control
  • the RRC layer generates the identifier when a radio access bearer is established, and discards the identifier when the radio access bearer is released.
  • the MBMS identifier is assigned by an RRC (Radio Resource Control) layer of UTRAN.
  • the MBMS identifier is assigned to the terminal group through an RRC message.
  • the MBMS identifier is included in the header of the MBMS protocol data unit.
  • the MBMS protocol data unit is an MAC protocol data unit and the header is a header of the MAC protocol data unit.
  • the MBMS protocol data unit includes an identifier type indicator indicating a type of the identifier.
  • the identifier type indicator is included in the header of the MBMS protocol data unit.
  • the MBMS protocol data unit is an MAC protocol data unit and the header is a header of the MAC protocol data unit.
  • the MBMS data receiving step includes: checking whether the MBMS identifier is included in the MBMS protocol data unit; checking whether the MBMS identifier included in the MBMS protocol data unit is identical to the previously assigned MBMS identifier if the MBMS identifier is included in the MBMS protocol data unit; removing a header from the MBMS protocol data unit if the two identifiers are identical; and transferring the header-removed MBMS protocol data unit to an upper layer of a terminal.
  • the terminal checks whether the MBMS identifier is included in the MBMS protocol data unit by checking whether an identifier type indicator of the MBMS protocol data unit indicates the MBMS identifier.
  • the identifier type indicator indicates a type of the identifier included in the MBMS protocol data unit.
  • the terminal discards the received MBMS protocol data unit.
  • the multimedia service providing method of a universal mobile telecommunication system of the present invention further includes: constructing feedback information on the received MBMS data; and adding the MBMS identifier to feedback information of the MBMS data and transferring it to UTRAN by each terminal.
  • a multimedia service providing method in an universal mobile telecommunication system in which multimedia broadcast/multicast service (MBMS) is provided to a terminal group consisting of plural terminals, including: transferring plural physical channel information to a terminal group; assigning an MBMS identifier to terminals which are to receive an MBMS data; and obtaining information of a specific physical channel indicated by the MBMS identifier from the plural physical channel information and receiving the MBMS data.
  • MBMS multimedia broadcast/multicast service
  • the MBMS identifier is an MBMS radio network temporary identifier (RNTI).
  • RNTI radio network temporary identifier
  • the MBMS identifier indicates the specific physical channel by indicating the number of the specific physical channel included in the plural physical channel information.
  • the physical channel is a secondary common control physical channel transmitting MBMS data.
  • information of the physical channel is a list of plural channels transmitting MBMS data and a parameter indicating a channel code of the physical channel, a scrambling code, a size of a data to be transmitted, a time interval at which data is transmitted, a channel coding, and a type of a transport channel mapped with a corresponding physical channel and a logical channel.
  • the MBMS data receiving step includes: selecting a specific physical channel indicated by the MBMS identifier among the plural physical channels included in the plural physical channel information; obtaining information on the selected physical channel from the plural physical channel information; establishing the selected physical channel by each terminal; and receiving the MBMS data through the selected physical channel.
  • Figure 1 illustrates a network structure of a general UMTS system
  • Figure 2 illustrates a structure of a radio protocol between a terminal and UTRAN on the basis of a 3GPP radio access network standard
  • Figure 3 is a signal flow chart showing a process of generating MBMS RNTI in UTRAN when an MBMS RAB is generated for an MBMS service in accordance with the present invention
  • Figure 4 is a signal flow chart showing a process of assigning MBMS RNTI to a terminal which is to receive an MBMS service after an MBMS RAB and an MBMS RNTI are generated in accordance with the present invention
  • Figure 5 is a signal flow chart showing a process of receiving a data of a corresponding MBMS service by a terminal which has been assigned the MBMS RNTI in accordance with the present invention
  • Figure 6 is a signal flow chart showing a process of discarding the MBMS RNTI assigned to a terminal by UTRAN in accordance with the present invention
  • Figure 7 is a signal flow chart showing a process of discarding the MBMS RNTI by UTRAN when the MBMS RAB for an MBMS service is discarded in accordance with the present invention
  • Figure 8 is a signal flow chart showing a process of selecting a physical channel for receiving a data of a corresponding MBMS service by a terminal through allocation of MBMS RNTI in accordance with the present invention.
  • the present invention is implemented in such a mobile communication system as the UMTS (universal mobile telecommunications system), which has been recently developed by 3GPP.
  • UMTS universal mobile telecommunications system
  • 3GPP 3rd Generation Partnership Project
  • the present invention can be also applied to a communication system operated with different standards. Preferred embodiments of the present invention will now be described.
  • the present invention proposes an MBMS RNTI (MBMS Radio Network Temporary Identifier) used when MBMS service-related information is given and taken between UTRAN and a terminal or between nodes in UTRAN in case that UTRAN provides an MBMS service, in which the MBMS RNTI serves as a identifier for a specific MBMS service or a multicast group.
  • MBMS RNTI MBMS Radio Network Temporary Identifier
  • the MBMS RNTI is added as header information of an MBMS data transmitted to a user plane of a radio protocol.
  • the MBMS RNTI can be included in an MAC header.
  • the MBMS RNTI is included in the MAC header so that the MAC layer that is responsible for MBMS can recognize whether the received MBMS data belongs to the MAC layer itself.
  • MBMS RNTI is used as an identifier indicating a specific MBMS service provided in one RNS.
  • MBMS RNTI is also used as an identifier for indicating a group of users receiving a specific multicast service in one RNS.
  • MBMS RNTI corresponds to an identifier indicating a set of users who receive a service from a specific RNS among users belonging to a multicast group.
  • MBMS RNTI is generated by the UTRAN when an MBMS RAB is set up for an MBMS service, and when the MBMS RAB is released, the MBMS RNTI is discarded.
  • the MBMS RAB refers to a radio access bearer set for a specific MBMS service.
  • MBMS RNTI is managed by the CRNC, and an arbitrary MBMS RNTI is used to identify a specific MBMS service only in a pertinent CRNC.
  • MBMS RNTI is included in the MAC header of an MBMS data when the data is transmitted, for which the RRC layer of UTRAN informs the MAC- c/sh sub-layer of the UTRAN, the MAC sub-layer that is responsible for MBMS in the UTRAN, of an MBMS RNTI value for a specific MBMS service.
  • the RRC layer of UTRAN informs the RRC layer of a terminal of the MBMS RNTI value by using an RRC message.
  • RRC layers of a plurality of terminals desired to receive the specific MBMS service are all assigned the MBMS RNTI value from the RRC layer of UTRAN. Thereafter, the RRC layers of the terminals desired to receive the specific MBMS service informs the MAC-c/sh sub-layer, the MAC sub-layer that is responsible for MBMS in the terminal, of the received MBMS RNTI value.
  • the MAC-c/sh sub-layer of UTRAN Upon receiving the MBMS RNTI value from the RRC layer of UTRAN, the MAC-c/sh sub-layer of UTRAN stores the received MBMS RNTI value. Thereafter, the MAC-c/sh sublayer of UTRAN includes the stored MBMS RNTI value in a header of an MAC PDU for a corresponding MBMS service. At this time, an identifier type indicator indicating that a type of the RNTI is the MBMS RNTI is also included in the header of the MAC PDU. The identifier type indicator informs what kind of RNTI is included in a corresponding MAC PDU.
  • the MAC-c/sh sub-layer of the terminal After receiving the MBMS RNTI value from the RRC layer of the terminal, the MAC-c/sh sub-layer of the terminal stores it. If the header of the received MAC PDU includes a terminal identifier type indicator, the MAC-c/sh sub-layer of the terminal recognizes what the terminal identifier type indicator indicates.
  • the MAC-c/sh sub-layer of the terminal compares MBMS RNTI stored in the MAC-c/sh sub-layer itself and MBMS RNTI included in the header of the received MAC PDU. If the two MBMS RNTI values are the same with each other, the MAC-c/sh sub-layer of the terminal transfers the corresponding data to the upper layer of the terminal.
  • Figure 3 shows a process of generating MBMS RNTI, in which UTRAN generates MBMS RNTI when MBMS RAB is generated for an arbitrary MBMS service.
  • UTRAN RRC generates MBMS RNTI for an MBMS service
  • UTRAN MAC-c/sh stores the MBMS RNTI (S3).
  • Figure 4 shows a process of assigning MBMS RNTI to a terminal, in which after MBMS RAB and MBMS RNTI are generated, MBMS RNTI is assigned to a terminal for receiving a corresponding MBMS service.
  • the UTRAN RRC transfers MBMS RNTI for an MBMS service to a terminal RRC through an RRC message (S4), the terminal RRC transfers MBMS RNTI to a terminal MAC-c/sh (S5).
  • the terminal MAC-c/sh stores the MBMS RNTI (S6), and then the terminal RRC informs the UTRAN RRC that MBMS RNTI has been completely assigned through an RRC message (S7). Thereafter, the terminal can receive MBMS data for the corresponding MBMS service.
  • Figure 5 shows a process of transmitting MBMS data, in which a terminal assigned MBMS RNTI receives data of a corresponding MBMS service. If an upper layer receives a data (MAC PDU) for a corresponding MBMS service.
  • MAC PDU data for a corresponding MBMS service.
  • UTRAN MAC-c/sh includes an identifier type indicator and the stored MBMS RNTI in a header of a corresponding MAC PDU (S10).
  • the identifier type indicator indicates that a type of included RNTI is MBMS RNTI.
  • UTRAN MAC-c/sh transfers an MAC PDU to a terminal MAC-c/sh by using a service of a lower layer (S11 ).
  • the terminal MAC-c/sh compares MBMS RNTI of the received MAC PDU with the stored MBMS RNTI (S12). If the two RNTI values are the same with each other, the terminal MAC-c/sh removes the MAC header from the received MAC PDU, and then transfers the MBMS data included in the MAC PDU to an upper layer (S13).
  • Figure 6 shows a process of discarding MBMS RNTI stored in a terminal, in which UTRAN discards MBMS RNTI which has been assigned to the terminal.
  • UTRAN RRC requests a terminal RRC through an RRC message to discard MBMS RNTI for a corresponding MBMS service (S14).
  • the terminal RRC requests the terminal MAC-c/sh to discard MTMS RNTI according to the discard request (S15).
  • the terminal MAC-c/sh discards the stored MBMS RNTI, and the terminal RRC informs the UTRAN RRC through an RRC message that the MBMS RNTI has been discarded (S17). Thereafter, the terminal can not receive MBMS data for the corresponding MBMS service.
  • Figure 7 shows a process of discarding MBMS RNTI, in which UTRAN discards MBMS RNTI when MBMS RAB for an arbitrary MBMS service is discarded.
  • UTRAN can proceed with the process of Figure 7 and the process of Figure 8 together.
  • UTRAN RRC determines discard of MBMS RNTI for a corresponding
  • MBMS service in case that MBMS RAB is released for an MBMS service (S20), and requests the UTRAN MAC-c/sh to discard MBMS RNTI for the corresponding MBMS service (S21 ).
  • UTRAN MAC-c/sh discards the MBMS RNTI according to the RNTI discard request.
  • MBMS RNTI performs a function of indicating a radio resource used for a specific MBMS service.
  • UTRAN RRC informs the terminal RRC of channel information through system information of BCH.
  • the channel information refers to a parameter such as the number of a physical channel being provided for service in a corresponding cell, a channel code of each physical channel, a scrambling code, a size of data to be transmitted, time interval for data transmission, a channel coding, a type of transport channel and a logical channel mapped with a corresponding physical channel, or the like.
  • a specific MBMS RNTI indicates the number of the physical channel transmitting a data of a specific MBMS service.
  • UTRAN selects an S- CCPCH channel for transmitting a data of the corresponding MBMS service through the following equation (1 ):
  • the number of S-CCPCH MBMS RNTI modulo K (1 ) wherein the value 'K' corresponds to the number of S-CCPCH with which FACH channel transmitting MBMS data in a corresponding cell is mapped and the number of S-CCPCH corresponds to a list order of S-CCPCH channels existing in system information of the corresponding cell.
  • the terminal can be aware of channel information corresponding to the number of S-CCPCH through the S-CCPCH channel list of the system information transferred through the BCH channel. Accordingly, the terminal calculates the number of S-CCPCH by substituting first assigned MBMS RNTI to equation (1 ) and obtains information of the calculated S-CCPCH channel from the system information, thereby receiving transmitted MBMS data.
  • Figure 8 shows a process of allocating a physical channel through MTMS RNTI, in which a terminal selects a physical channel for receiving a data of a corresponding MBMS service through MBMS RNTI assignment.
  • UTRAN RRC sets up a lower layer for transmission of MBMS data (S23). That is, UTRAN RRC allows a physical layer, MAC, RLC and PDCP layer of UTRAN to set a parameter such as the number of the physical channel S-CCPCH provided for service in a corresponding cell, a channel code and a scrambling code of each physical channel, a size of a data to be transmitted, a time interval for data transmission, a channel coding and a type of transport channel and a logical channel mapped with a corresponding physical channel. Through this process, the physical S-CCPCH transmitting a MBMS data is set up.
  • a parameter such as the number of the physical channel S-CCPCH provided for service in a corresponding cell, a channel code and a scrambling code of each physical channel, a size of a data to be transmitted, a time interval for data transmission, a channel coding and a type of transport channel and a logical channel mapped with a corresponding physical channel
  • the UTRAN RRC transmits channel information to the RRC of a terminal through system information of BCH (S24).
  • the channel information refers to the parameter such as the number of the physical channel provided for service in a corresponding cell, a channel code and a scrambling code of each physical channel, a size of a data to be transmitted, a time interval for data transmission, a channel coding and a type of transport channel and a logical channel mapped with a corresponding physical channel.
  • the terminal RRC stores the physical channel information (S25), and the UTRAN assigns MBMS RNTI to a corresponding terminal through the MBMS RNTI assignment process (S26).
  • the terminal RRC obtain information on the physical channel S- CCPCH indicated by the MBMS RNTI and a transport channel and a logical channel mapped with the channel form the physical channel information (S27). That is, the terminal RRC obtains the parameter such as a channel code and a scrambling code of the physical channel S-CCPCH transmitting a data of the specific MBMS service, a size of a data to be transmitted, a time interval for data transmission, a channel coding and a type of transport channel and a logical channel mapped with a corresponding physical channel. The terminal RRC sets a lower layer of the terminal by using the obtained channel information (S28).
  • a physical layer, MAC, RLC and PDCP layer of the terminal are set by using the obtained channel information.
  • the physical S-CCPCH for receiving a data of the corresponding MBMS service is set.
  • the terminal can receive the data of the MBMS service through the transport channel FACH.
  • the RRC layer of MBMS controls the transport channel and the physical channel with respect to set-up, re-set-up and release of RB to which MBMS RAB is mapped.
  • an RRC message is exchanged between RNC and UE. That is, MBMS RNTI is inserted into the RRC message for a specific MBMS service to identify a specific MBMS service.
  • MBMS RNTI is included in the feedback information to identify the corresponding feedback information.
  • the specific MBMS RNTI is included in the RRC message transmitting the feedback information.
  • the multimedia service providing method of universal mobile telecommunication system of the present invention has the following advantages. That is, when UTRAN provides an MBMS service, MBMS RNTI is used to give and take MBMS service-related information between UTRAN and the terminal or between nodes in UTRAN. Therefore, not only does a user group receiving an MBMS data can be easily recognized but also a data of a specific MBMS service can be easily recognized. In addition, when data is transmitted to a plurality of terminals, that is, to a terminal group, by using a point-to-multipoint radio service, specific groups receiving the data can be discernible. Thus, only MBMS data corresponding to a corresponding terminal can be transferred from the MAC layer to the upper layer. Moreover, MBMS RNTI indicates plural terminals with one identification information, so that the length of a header can be reduced compared with the use of RNTI as in the conventional art.
  • the use of an identifier temporarily assigned in UTRAN obtains an effect of protecting information of MBMS data compared with the use of a fixed message identifier.
  • MBMS RNTI indicates a specific radio resource
  • a radio resource can be automatically assigned to plural terminals even without an assignment control message, and thus, complexity of scheduling of MBMS data transmission can be reduced.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Databases & Information Systems (AREA)
  • Multimedia (AREA)
  • Mobile Radio Communication Systems (AREA)
  • Data Exchanges In Wide-Area Networks (AREA)

Abstract

La présente invention concerne un service de diffusion/multidiffusion multimédia (MBMS) dans un système universel de télécommunication mobile (UMTS). Lorsque un UTRAN assure un MBMS, des informations associées à un service sont échangées entre l'UTRAN et un terminal ou entre des noeuds de l'UTRAN à l'aide d'un RNTI pour un MBMS, de sorte qu'un groupe d'utilisateurs recevant des données MBMS ou une donnée d'un MBMS spécifique peut être identifié.
EP03760965.8A 2002-06-22 2003-06-23 Procede de fourniture de services multimedia dans un systeme de radiocommunication mobile Expired - Lifetime EP1516445B1 (fr)

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KR1020020035179A KR20030097559A (ko) 2002-06-22 2002-06-22 무선이동통신 시스템의 멀티미디어 서비스 방법
KR2002035179 2002-06-22
PCT/KR2003/001228 WO2004002021A1 (fr) 2002-06-22 2003-06-23 Procede de fourniture de services multimedia dans un systeme de radiocommunication mobile

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